Heat Recovery Device and Economizer problems

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I have a CDQ taking in 100% Outdoor Air, and providing this air to two
air handling units. There is both a heat recovery enthalpy wheel and a
water side economizer in the CDQ and when these are applied, in the
month's of March, April, and November, my simulation outputs large
(seemingly random) spikes in Total system supply air flow rate (cfm) for
the CDQ and in-turn the ventilation fans providing the power. But when I
disconnect these two devices I get nice results. Would anyone know why
this would be?

Patrick Darby, BScE

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Joined: 2011-09-30
Reputation: 0